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Cadillac engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1999 Cadillac DeVille - Engine - 1/20/2014
    What is wrong when dic message is: theft system not working, car may not start
    i turned the car off and it did restart. and mwssage has not reappeared
     
    • HouseCallAuto
      1/20/2014 HouseCallAuto
      In most cases it means that you need a new ignition lock cylinder. There is a bypass if you Google "PassKey bypass". It might not start at any time so do not ignore this message.
  • calvin roberson
    calvin roberson - 1998 Cadillac Eldorado - Engine - 1/15/2014
    I put a 1997 4.6 in my 98 cad same vin # s' same hook ups. now I have code p0340 cam shaft position sensor a circuit or
    single sensor. I replaced cam & both crank sensors trippled checked wireing verified all conunity & voltage checks ok put I still have same code. help
     
    • HouseCallAuto
      1/13/2014 HouseCallAuto
      Replace the ignition control module. I can tell you how to check and confirm this as your cause but unless you have a automotive lab scope to look at the waveforms you can't. That said, replace the ICM and this stands a high probability of a fix.
      HouseCallAuto
      1/15/2014 calvin roberson
      have replaced ICM ignition control mod 2x also replaced ecm electronic control mod (computer) 2x & had cad delear repogram service dept test said that computer malfunction need new one. the ones I have are remanutactory. I think they wanted more money. needless so say their estimate was more than cars worth.
    • HouseCallAuto
      1/15/2014 HouseCallAuto
      I assume that the engine still runs? You did not say.

      1. Using the labscope, check the crank and cam sensor signals making sure they are in sync with each other
      .
      2. If the cam and crank are out of sync, check to see if the timing chain has jumped on the cam sprocket or if the chain was installed incorrectly.

      If the cam and crank sensors are out of sync with each other, a code P0340 will set. When this happens, all the signals in from the sensors cam, crank sensor A, and B will be good, but there will be no output from the ignition module to the Powertrain Control Module (PCM) for the cam sensor.

  • AutoMD Member
    AutoMD Member - 2003 Cadillac CTS - Engine - 1/9/2014
    What does it cos to repair heating coil
    Car starts smoking when it warms up or I use my heat.
     
    • Jimm
      1/9/2014 Jimm
      The heater core part itself is inexpensive; around $43.00 from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities.

      The expense will be to have the new heater core installed, try the 'Find-A-Shop' and 'Estimate Cost' resources on the AutoMD website.
  • rod
    rod - 1990 Cadillac DeVille - Engine - 1/8/2014
    Why does my car not start even when being jumped?
    it turns over and sometimes backfires but still does not start
     
    • HouseCallAuto
      1/8/2014 HouseCallAuto
      Check the ignition rotor for being loose / falling off, seen that a lot on caddy.
  • AutoMD Member
    AutoMD Member - 1999 Cadillac Seville - Engine - 1/7/2014
    1999 Cadillac STS Dies in the Extreme Cold
    I own a 1999 Cadillac STS. For a long time the car was dying on me while I was idle at a stop light. What would happen would be, once I came to a complete stop and sit idle for a while the engine would just stop. I would then have to turn the car off, and upon ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1999 Cadillac DeVille - Engine - 12/31/2013
    I've had my codes read, and some of them printed out, I need an automd opinion...
    I went to autozone, the guy read my codes and printed out some of them: P0174, P0302, P0171, P0151, P0131, P0741; I was also told I may need my crankshaft position sensors checked out...
     
    • Jimm
      12/31/2013 Jimm
      Too many codes. As a first step - disconnect the negative battery connection for at least 20 minutes to clear all the fault codes. Then, reconnect and drive like normal. Have the fault codes re-read to see which one is priority. Post a reply with this fault code for further assistance.
    • HouseCallAuto
      12/31/2013 HouseCallAuto
      P0171 and P0174 indicate a vacuum leak and this car being a Cadillac I would bet with a greater than 99% accuracy that the air intake boot that is between the throttle body and the intake manifold has a crack at the bottom.
      P0302 is a misfire on cylinder number 2 - bad ignition wire or bad coil or bad spark plug or even a misfire because of the vacuum leak or a code is stored from when you had run the engine with the #2 wire disconnected.
      P0131 and P0151 would both also set as a result of the vacuum leak
      The worst code you have going on here is the P0741 code which most times is a bad code to get because it usually means the tranny has a serious internal problem.

      Happy New Year
  • AutoMD Member
    AutoMD Member - 1997 Cadillac DeVille - Engine - 12/30/2013
    Will not start turns over
    has spark will run with starting spray
     
    • HouseCallAuto
      12/30/2013 HouseCallAuto
      Plug in a code reader and see what fault codes are stored. That is the next thing to do. This step cannot be skipped. Amazon has a code reader for $17 with free shipping. Post the code numbers after you read codes and update this post.
  • AutoMD Member
    AutoMD Member - 1999 Cadillac DeVille - Engine - 12/30/2013
    Is my engine about to blow?; what are symptoms of fuel injector problems?
    my car does not start right up like it should, and this is every time I have to start it; it has to crank a little bit maybe misfire a couple times and then start; its making my car act like it wants to stall out at the stop light, and the stop sign and I'm sure ...
     
    • Jimm
      12/30/2013 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
    • HouseCallAuto
      12/30/2013 HouseCallAuto
      Code reader - amazon - $17 - takes minutes
  • AutoMD Member
    AutoMD Member - 1999 Cadillac DeVille - Engine - 12/26/2013
    Why am I having trouble with my car starting right up; it has to turn over a bunch before it starts up
    the mileage is 149-150,000; I've had the car since April 2013; I've just had a new injector rail, wires, plugs, battery, and fuel pump put in right before chrstms; it still will not start right up like it should and this is every time I start it to go somewhere; ...
     
    • HouseCallAuto
      12/26/2013 HouseCallAuto
      Go to amazon.com and buy a code reader for like $17 with shipping included. reading the codes takes a minute. Why rely on someone else to read codes when you can do it anytime you need to yourself and then post the code numbers here. Your Cadillac is one of the few cars on the road that allows codes to be accessed through the climate control panel. You can try to do this INSTEAD of buying a code reader but you will need to watch this YouTube video >> http://www.youtube.com/watch
      HouseCallAuto
      12/27/2013 AutoMD Member
      I don't think that youtube video is much help; that's not even a DeVille dash, and I don't believe I have a passenger warmer button... but I'll give it a shot
  • tom carter
    tom carter - 2001 Cadillac Catera - Engine - 12/21/2013
    Why is my battery depleated
    temp runs above normal and cooling fans come on in addition to other electric equipment.
     
    • CVO
      12/21/2013 CVO
      Usually it means that the alternator isn't charging the battery. Batteries store electricity .
      Local auto parts stores will test this battery and their charging system for free of charge.
      Note: a 3/4 charge battery is 12.50 volts
      A discharge battery is 11.75 volts.
      A battery under a cranking load and it is reading less than 7 volts,it will be a recycled battery.
  • AutoMD Member
    AutoMD Member - 1999 Cadillac DeVille - Engine - 12/16/2013
    Why won't my car start, after having a new injector rail, wires, plugs, and battery put in??!!!!!
    the milage is 149-150,000; 2 days ago I put my caddy in the shop to have the rail, wires, and plugs done; when I picked it up I had trouble starting it; although it's running alot better; I made it to AutoZone, had the guy check the battery, oil, and alternator, the ...
     
    • HouseCallAuto
      12/15/2013 HouseCallAuto
      It seems that one of the battery cables to the new battery has corrosion or you failed to tighten it enough. Be careful tightening it as it is soft lead and over-tightening will damage the threads. But it does seem that is what is happening being that you replaced the battery after it left the shop.
    • chuck
      12/16/2013 chuck
      loose connection at battery
  • AutoMD Member
    AutoMD Member - 2002 Cadillac DeVille - Engine - 12/15/2013
    After 15-20 minutes of driving the idling becomes rough
    it has 130000 miles, I have replaced thermostat, plugs, plug boots, mass air flow sensor and throttle sensor
     
    • Jimm
      12/15/2013 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
    • HouseCallAuto
      12/15/2013 HouseCallAuto

      1. Check for vacuum leak at the boot between the throttle body and the upper intake manifold plenum.

      2. Spray a mist of water on the upper intake manifold, check for RPM response. If there is a change in running quality replace the boot. very common.
  • AutoMD Member
    AutoMD Member - 2002 Cadillac DeVille - Engine - 12/15/2013
    After about 15-20 of driving the idling becomes rough
    car has almost 130,000 miles, I have replaced thermostat, plugs, plug boots, mass air flow sensor and throttle position sensor. only happens after car warmed up
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2005 Cadillac CTS - Engine - 12/14/2013
    Key stuck in ignition
    went to start car, lights came on but nothing happened. Now key is stuck in ignition and some dash lights are still on
     
    • HouseCallAuto
      12/14/2013 HouseCallAuto
      There is a very high probability of the cause of this being a bad Powertrain Control Module (PCM). The only thing you could do that would likely confirm this is by plugging in a code reader to the diagnostic connector under the dash. If your code reader is UNABLE to establish communication with the PCM then that pretty much says the PCM had a stroke. The key being stuck and no comminication = bad PCM.
 
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